<input (keyup.enter)="_selectValue()" type="text" class="input_style" placeholder="请输入同义词名称" matInput [formControl]="myControl" [matAutocomplete]="auto">
<mat-autocomplete [displayWith]="displayFn" autoActiveFirstOption #auto="matAutocomplete" (optionSelected)="onSelectionChanged($event.option)">
    <mat-option *ngFor="let option of options" [value]="option">
        {{option['txt']}}
    </mat-option>
</mat-autocomplete>
